The illusion of separation exists for a good reason. The reason is companionship. Without seeing each other as separate we (the One) would still be/feel alone. So it - Life - is fundamentally all about companionship. Hence also the gospel of love. Treat your neighbor as your Self. That type of thing. So basically all that we can do is love each other whenever and wherever possible. Not to fight. Not to let things spin out of control. Or at least know that we share a single origin and that we are not here to make each others life miserable. That would already be a big improvement.